> I think I need to emphasize a point better: there are infinitely many objective measures.
No one here or anywhere is arguing that there are no objective measures. Of course, there is! The question is whether there is an objective measure from which good or bad is determined. Or in a logical statement, whether this statement is true: There exists something that is an objective measure AND from it good or bad is determined.
> It's objectively true that humans ... It's objectively true that humans ...
There are humans, albeit in minority, that take pleasure from painful experiences. While most of us want to maximize our lifespan, soldiers do not. They consider protecting their nations are far more important than their life. While most of us want to minimize suffering, Mother Teresa was instead experiencing prolong suffering for the sake of, not her family, not her friends, but strangers. Despite all of this, we all agree that what soldiers and Mother Terese did is "good." So no, none of your "It's objectively true that humans ..." statements are true, unless, as I said in the previous comment, you're willing to redefine "objective" as the majority's preference.
> We should seek to perform those actions which minimize the number of rusty nails jammed into eyes and maximize the number of times humans can enjoy nice meals when they're hungry.
I assume this is the objective measure that you think from which good or bad is determined? Say all humans agree with this objective, the obvious follow-up question could be: Which is worse: having 10 nails in each pair of eyes of 10 people, or having 1 nail in either eye of 100 people? Even if everyone agreed with the initial objective, they wouldn't unanimously say one case is worse than the other.
Okay, I suppose what you wanted to say is to minimize suffering and maximize happiness, which is a very common argument. It's a seemingly crazy question, but why? Pain is not inherently bad. If you think about it, pain is just a signal to the brain that something dangerous is happening. From the survival's perspective, it's even good! Unnecessary pain is bad, you might say. Not really, because it doesn't change anything. Only when you argue that excessive pain can be harmful to survival that the question of why can end. Why maximizing the chance of survival? Otherwise, life couldn't survive and we wouldn't have this discussion. Yes, it's a tautology. In fact, I already explained this in my original post [1].
As I explained in my original post [1], if the three premises written in the very beginning were true, "good" or "bad" would be nothing else other than being beneficial for survival or not. But this view of morality is not without its problems. At the end of the post I also mentioned that morality doesn't always align with beneficialness for survival. So, what now? I have written a follow-up in [2] as a response to another commenter.
---